Ólafsdóttir, Anna H; Pampoulie, Christophe: Fish and invertebrate trawl sampling south and west of Iceland in July 2021 [dataset]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.942987 (dataset in review)
Abstract:
This data set has trawl catch weight and biological measurements from the latter half of the Icelandic part of the International Ecosystem Summer Survey in Nordic Seas (IESSNS) conducted in July 2021. The survey area was from the coast and over the shelf edge south and west of Iceland, defined as IESSNS strata 5 and 6, see embedded map. The survey period was July 17 – 26, 2021, and samples were collected at 30 trawl stations. A specifically designed scientific trawl, called Multpelt832 (ICES, 2013a-b, Valdemarsen et al 2014) with cod-end mesh size of 50 mm, was used at all 30 stations. Trawl depth ranged from surface (trawl headline in surface) at 22 stations and 8 stations was trawling deeper in the water column targeting specific acoustic backscatter with trawl depth of 100 – 400 m. All trawl catch was identified to lowest possible taxonomic level, total weight of each species recorded, and length and weight of 50 specimen per species measured, or all if less was caught.
For blue whiting (Micromesistius poutassou) more biological measurements are provided such as sex, maturity, age, and stomach weight. For age determination, the otolith was extracted whole from the blue whiting at sea and read whole under a dissecting microscope on land by an experienced age reader part of the ICES framework. Gonad maturity stage was visually estimated at sea during sampling by an experienced technician. The maturity stages are 1-7, where 1 is immature, 2 is beginning to mature or beginning to recovering from previous spawning event, 3 is maturing, 4 is maturing, 5 is getting fully mature, 6 is spawning, and 7 has finished spawning. For taxa Scyphozoa and Natantia decapods only total catch weight per station is recorded.
In total, length measurements are provided for 1774 specimens and weight for 1101 specimen. Each specimen is one row in the dataset file. Information for three pelagic fish species is excluded from the data set and these species are mackerel (Scomber scombrus), herring (Clupea harengus) and lump fish (Cyclopterus lumpus). For detailed information about the survey see the survey report, in Icelandic and abstact, figure and table headings also provided in English. Various information about the trawling operation and weather is included in the file. The data is provided by the Marine and Freshwater Research Institute (MFRI) in Iceland.
Keyword(s):
Related to:
International Council for the Exploration of the Sea (ICES) (2013): Report of the Working Group on Improving Use of Survey Data for Assessment and Advice (WGISDAA). Marine Institute, Dublin, Ireland. ICES CM 2013/SSGESST:07, 22 pp.
International Council for the Exploration of the Sea (ICES) (2013): Report of the Workshop on Northeast Atlantic Mackerel monitoring and methodologies including science and industry involvement (WKNAMMM). ICES Headquarters, Copenhagen and Hirtshals, Denmark. ICES CM 2013/SSGESST:18, 33 pp.
Valdemarsen, J W; Jacobsen, J A; Óskarsson, Guomundur J; Utne, Kjell Rong; Einarsson, H A; Sveinbjörnsson, Sveinn; Smith, L; Zachariassen, K; Nøttestad, Leif (2014): Swept area estimation of the North East Atlantic mackerel stock using a standardized surface trawling technique. Working Document (WD) to ICES WKPELA, 14 pp.
Further details:
Ólafsdóttir, Anna H; Finnbogadóttir, Gudrún; Kennedy, James; Sigurgeirsdóttir, Sólrún; Aradóttir, Svandís Eva (2022): Results of the Icelandic part of the International Ecosystem Summer Survey in Nordic Seas (IESSNS) in July 2021 on R/V Árni Friðriksson. Marine and Freshwater Research Institute, Iceland, 40 pp., IESSNS_IS_2021.pdf
Project(s):
Funding:
Coverage:
Median Latitude: 63.290562 * Median Longitude: -21.723796 * South-bound Latitude: 62.713500 * West-bound Longitude: -30.673000 * North-bound Latitude: 65.210667 * East-bound Longitude: -15.269000
Date/Time Start: 2021-07-17T08:06:00 * Date/Time End: 2021-07-26T01:43:00
Minimum Elevation: -2454.0 m * Maximum Elevation: -138.0 m
Event(s):
A12-2021_324 * Latitude Start: 63.317333 * Longitude Start: -15.349167 * Latitude End: 63.278000 * Longitude End: -15.341167 * Date/Time Start: 2021-07-17T08:06:00 * Date/Time End: 2021-07-17T08:36:00 * Elevation Start: -1475.0 m * Elevation End: -1422.0 m * Location: Nordic Seas * Campaign: IESSNS_2021 (A12-2021) * Basis: Arni Fridriksson * Method/Device: Multipurpose pelagic trawl - 832 (MULTPELT-832)
A12-2021_325 * Latitude Start: 62.802667 * Longitude Start: -15.269000 * Latitude End: 62.863000 * Longitude End: -15.283500 * Date/Time Start: 2021-07-17T13:26:00 * Date/Time End: 2021-07-17T14:26:00 * Elevation Start: -1850.0 m * Elevation End: -1850.0 m * Location: Nordic Seas * Campaign: IESSNS_2021 (A12-2021) * Basis: Arni Fridriksson * Method/Device: Multipurpose pelagic trawl - 832 (MULTPELT-832)
A12-2021_327 * Latitude Start: 63.047500 * Longitude Start: -16.406667 * Latitude End: 63.010500 * Longitude End: -16.386500 * Date/Time Start: 2021-07-18T00:06:00 * Date/Time End: 2021-07-18T00:36:00 * Elevation Start: -1531.0 m * Elevation End: -1552.0 m * Location: Nordic Seas * Campaign: IESSNS_2021 (A12-2021) * Basis: Arni Fridriksson * Method/Device: Multipurpose pelagic trawl - 832 (MULTPELT-832)
Comment:
MFRI = Marine and Freshwater Research Institute
ASFIS 3A = List of Species for Fishery Statistics Purposes (3-alpha) [Food and Agriculture Organization of the United Nations].
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | Ólafsdóttir, Anna H | |||
| 2 | Country | Country | Ólafsdóttir, Anna H | |||
| 3 | Year of observation | Year obs | a AD | Ólafsdóttir, Anna H | ||
| 4 | Cruise/expedition | Expedition | Ólafsdóttir, Anna H | |||
| 5 | Station label | Station | Ólafsdóttir, Anna H | |||
| 6 | Comment | Comment | Ólafsdóttir, Anna H | Trawl station type (Ptrawl = surface, DeepTrawl = watercolumn) | ||
| 7 | Gear | Gear | Ólafsdóttir, Anna H | Sampling platform (Vessel name and registration number) | ||
| 8 | DATE/TIME | Date/Time | Ólafsdóttir, Anna H | Geocode – Trawl in water | ||
| 9 | DATE/TIME | Date/Time | Ólafsdóttir, Anna H | Geocode – Trawl out of water | ||
| 10 | LATITUDE | Latitude | Ólafsdóttir, Anna H | Geocode – Trawl in water | ||
| 11 | LONGITUDE | Longitude | Ólafsdóttir, Anna H | Geocode – Trawl in water | ||
| 12 | Latitude 2 | Latitude 2 | Ólafsdóttir, Anna H | Trawl out of water | ||
| 13 | Longitude 2 | Longitude 2 | Ólafsdóttir, Anna H | Trawl out of water | ||
| 14 | Depth, bathymetric | Bathy depth | m | Ólafsdóttir, Anna H | Trawl in water | |
| 15 | Depth, bathymetric | Bathy depth | m | Ólafsdóttir, Anna H | Trawl out of water | |
| 16 | Species code | Spec code | Ólafsdóttir, Anna H | ASFIS 3A | ||
| 17 | Taxon/taxa | Taxa | Ólafsdóttir, Anna H | |||
| 18 | Towing speed | Towing speed | kn | Ólafsdóttir, Anna H | At tow depth | |
| 19 | Trawling time | Trawl t | min | Ólafsdóttir, Anna H | At tow depth | |
| 20 | Trawling distance | Trawling dis | nmi | Ólafsdóttir, Anna H | At tow depth | |
| 21 | Trawl vertical opening | Trawl v open | m | Ólafsdóttir, Anna H | At tow depth | |
| 22 | Trawl door horizontal opening | Trawl door h open | m | Ólafsdóttir, Anna H | At tow depth | |
| 23 | Trawl headline depth | Trawl headline depth | m | Ólafsdóttir, Anna H | Tow begins | |
| 24 | Trawl headline depth | Trawl headline depth | m | Ólafsdóttir, Anna H | Tow ends | |
| 25 | Code | Code | Ólafsdóttir, Anna H | Fishing gear type (MFRI code) | ||
| 26 | Mesh size | Mesh size | mm | Ólafsdóttir, Anna H | Codend meshsize | |
| 27 | Sweeps length | Sweeps l | m | Ólafsdóttir, Anna H | ||
| 28 | Wire length | Wire length | m | Ólafsdóttir, Anna H | Wrap wire length | |
| 29 | Wind speed | ff | m/s | Ólafsdóttir, Anna H | ||
| 30 | Wind direction | dd | deg | Ólafsdóttir, Anna H | ||
| 31 | Cloud coverage | Cloud cov | Ólafsdóttir, Anna H | Scale 1 - 8 | ||
| 32 | Temperature, water | Temp | °C | Ólafsdóttir, Anna H | At 5 m depth from surface | |
| 33 | Temperature, air | TTT | °C | Ólafsdóttir, Anna H | At sea level | |
| 34 | Pressure, atmospheric | PPPP | hPa | Ólafsdóttir, Anna H | ||
| 35 | Length | l | cm | Ólafsdóttir, Anna H | Fish measuring board | |
| 36 | Weight, total, wet | w tot wet | g | Ólafsdóttir, Anna H | Fish, wet weighted | |
| 37 | Sex | Sex | Ólafsdóttir, Anna H | Visual identification (VID) | ||
| 38 | Maturity index | c-p | Ólafsdóttir, Anna H | Visual identification (VID) | Stage 1-6 | |
| 39 | Liver, mass | Liver m | g | Ólafsdóttir, Anna H | Weighted | |
| 40 | Stomach, wet mass | Stom wm | g | Ólafsdóttir, Anna H | Weighted | |
| 41 | Age | Age | a | Ólafsdóttir, Anna H | Otolith reader | Age of fish in years |
| 42 | Mass | Mass | kg | Ólafsdóttir, Anna H | Weighted | Total weight per species per station |
| 43 | Number of individuals | Ind No | # | Ólafsdóttir, Anna H | Counting, visual | Specimen length measured per species per station |
| 44 | Number of individuals | Ind No | # | Ólafsdóttir, Anna H | Counting, visual | Specimen aged per species per station |
| 45 | Number of individuals | Ind No | # | Ólafsdóttir, Anna H | Counting, visual | Specimen weighted per species per station |
| 46 | Identification | ID | Ólafsdóttir, Anna H | Sample identification number (MFRI database) |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0) (License comes into effect after moratorium ends)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
62876 data points
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